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El-Sawaf AK, Nassar AA, Tolan DA, Ismael M, Alhindawy I, M El-Desouky E, El-Nahas A, Shahien M, Maize M. A mesoporous Mo and N Co-doped TiO 2 nanocomposite with enhanced photocatalytic efficiency. RSC Adv 2024; 14:3536-3547. [PMID: 38259997 PMCID: PMC10801452 DOI: 10.1039/d3ra07258d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 01/04/2024] [Indexed: 01/24/2024] Open
Abstract
This study reports the synthesis of a mesoporous Mo and N codoped anatase TiO2 nanocomposite with many oxygen vacancies using a simple one-step hydrothermal method and subsequent calcination treatment. Both Mo and N were effectively co-incorporated into the anatase phase of TiO2 without MoOx phase segregation. The codoped catalyst demonstrated a mesoporous architecture with a surface area of 107.48 m2 g-1 and a pore volume of 0.2974 cm3 g-1. X-ray photoelectron spectroscopy confirmed that both Mo and N dissolved in the TiO2 lattice and created induced oxygen vacancies. The interaction of the dopants (Mo and N) and oxygen vacancies clearly affected TiO2 crystal formation. Photocatalytic performance of the nanocomposite was investigated in terms of the decomposition of methyl orange at a concentration of 50 mg L-1 in an aqueous solution. The results revealed a significant methyl orange degradation of up to 99.6% after 30 min irradiation under a UV light. The impressive performance of the nanocomposite is assigned to the synergetic effect of important factors, including the co-doping of metallic (Mo) and non-metallic (N) elements, oxygen vacancy defects, bandgap, crystallite size, mesoporous structure, and BET surface area.
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Affiliation(s)
- Ayman K El-Sawaf
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | - Amal A Nassar
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
| | - Dina A Tolan
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | | | | | | | - Ahmed El-Nahas
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | - Mohammed Shahien
- Central Metallurgical Research & Development Institute (CMRDI) Helwan 11421 Egypt
| | - Mai Maize
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
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Tolan DA, El-Sawaf AK, Alhindawy IG, Ismael MH, Nassar AA, El-Nahas AM, Maize M, Elshehy EA, El-Khouly ME. Effect of bismuth doping on the crystal structure and photocatalytic activity of titanium oxide. RSC Adv 2023; 13:25081-25092. [PMID: 37622010 PMCID: PMC10445215 DOI: 10.1039/d3ra04034h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 08/08/2023] [Indexed: 08/26/2023] Open
Abstract
The doping of TiO2 with metals and non-metals is considered one of the most significant approaches to improve its photocatalytic efficiency. In this study, the photodegradation of methyl orange (MO) was examined in relation to the impact of Bi-doping of TiO2. The doped TiO2 with various concentrations of metal was successfully synthesized by a one-step hydrothermal method and characterized using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and UV-vis spectroscopy. The XRD results revealed that the anatase phase, with an average crystallite size of 16.2 nm, was the main phase of TiO2. According to the anatase texture results, it was found that the doping of TiO2 increased the specific surface area for Bi2O3@TiO2 without a change in the crystal structure or the crystal phase of TiO2. Also, XPS analysis confirmed the formation of Ti4+ and Ti3+ as a result of doping with Bi. The activities of both pure TiO2 and Bi-doped TiO2 were tested to study their ability to decolorize MO dye in an aqueous solution. The photocatalytic degradation of MO over Bi2O3@TiO2 reached 98.21%, which was much higher than the 42% achieved by pure TiO2. Doping TiO2 with Bi increased its visible-light absorption as Bi-doping generated a new intermediate energy level below the CB edge of the TiO2 orbitals, causing a shift in the band gap from the UV to the visible region, thus enhancing its photocatalytic efficiency. In addition, the effects of the initial pH, initial pollutant concentration, and contact time were examined and discussed.
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Affiliation(s)
- Dina A Tolan
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | - Ayman K El-Sawaf
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | | | | | - Amal A Nassar
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
| | - Ahmed M El-Nahas
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | - Mai Maize
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | | | - Mohamed E El-Khouly
- Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology (E-JUST) Alexandria 21934 Egypt
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Tolan DA, Elshehy EA, El-Said WA, Taketsugu T, Yoshizawa K, El-Nahas AM, Kamali AR, Abdelkader AM. Cubically cage-shaped mesoporous ordered silica for simultaneous visual detection and removal of uranium ions from contaminated seawater. Mikrochim Acta 2021; 189:3. [PMID: 34855016 DOI: 10.1007/s00604-021-05083-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 10/25/2021] [Indexed: 12/14/2022]
Abstract
A dual-function organic-inorganic mesoporous structure is reported for naked-eye detection and removal of uranyl ions from an aqueous environment. The mesoporous sensor/adsorbent is fabricated via direct template synthesis of highly ordered silica monolith (HOM) starting from a quaternary microemulsion liquid crystalline phase. The produced HOM is subjected to further modifications through growing an organic probe, omega chrome black blue G (OCBBG), in the cavities and on the outer surface of the silica structure. The spectral response for [HOM-OCBBG → U(VI)] complex shows a maximum reflectance at λmax = 548 nm within 1 min response time (tR); the LOD is close to 9.1 μg/L while the LOQ approaches 30.4 μg/L, and this corresponds to the range of concentration where the signal is linear against U(VI) concentration (i.e., 5-1000 μg/L) at pH 3.4 with standard deviation (SD) of 0.079 (RSD% = 11.7 at n = 10). Experiments and DFT calculations indicate the existence of strong binding energy between the organic probe and uranyl ions forming a complex with blue color that can be detected by naked eyes even at low uranium concentrations. With regard to the radioactive remediation, the new mesoporous sensor/captor is able to reach a maximum capacity of 95 mg/g within a few minutes of the sorption process. The synthesized material can be regenerated using simple leaching and re-used several times without a significant decrease in capacity.
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Affiliation(s)
- Dina A Tolan
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University, Alkharj, 11942, Saudi Arabia.,Chemistry Department, Faculty of Science, Menoufia University, Menoufia, Egypt
| | | | - Waleed A El-Said
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, 71516, Egypt.,Department of Chemistry, College of Science, University of Jeddah, P.O. Box 80327, Jeddah, 21589, Saudi Arabia
| | - Tetsuya Taketsugu
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan.,Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, 060-0810, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Ahmed M El-Nahas
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University, Alkharj, 11942, Saudi Arabia
| | - Ali Reza Kamali
- Energy and Environmental Materials Research Centre (E2MC), School of Metallurgy, Northeastern University, Shenyang, 110819, People's Republic of China
| | - Amr M Abdelkader
- Department of Engineering, Bournemouth University, Talbot Campus, Fern Barrow, Poole, BH12 5BB, UK.
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Tolan DA, Kashar TI, Yoshizawa K, El‐Nahas AM. Synthesis, spectral characterization, density functional theory studies, and biological screening of some transition metal complexes of a novel hydrazide–hydrazone ligand of isonicotinic acid. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6205] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Dina A. Tolan
- Department of Chemistry College of Science and Humanities Prince Sattam bin Abdulaziz University Al‐Kharj 11942 Saudi Arabia
- Chemistry Department, Faculty of Science Menoufia University Shebin El‐Kom 13829 Egypt
| | - Tahani I. Kashar
- Chemistry Department, Faculty of Science Menoufia University Shebin El‐Kom 13829 Egypt
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering Kyushu University Fukuoka 819‐0395 Japan
| | - Ahmed M. El‐Nahas
- Chemistry Department, Faculty of Science Menoufia University Shebin El‐Kom 13829 Egypt
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Emam SM, Tolan DA, El‐Nahas AM. Synthesis, structural, spectroscopic, and thermal studies of some transition‐metal complexes of a ligand containing the amino mercapto triazole moiety. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5591] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sanaa M. Emam
- Chemistry Department, Faculty of ScienceMenoufia University Shebin el Kom, 32512 Egypt
| | - Dina A. Tolan
- Chemistry Department, Faculty of ScienceMenoufia University Shebin el Kom, 32512 Egypt
- Department of Chemistry, College of Science and Humanities in Al‐KharjPrince Sattam bin Abdulaziz University Al‐Kharj 11942 Saudi Arabia
| | - Ahmed M. El‐Nahas
- Chemistry Department, Faculty of ScienceMenoufia University Shebin el Kom, 32512 Egypt
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Tolan DA, Abdel-Monem YK, El-Nagar MA. Anti-tumor platinum (IV) complexes bearing the anti-inflammatory drug naproxen in the axial position. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4763] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Dina A. Tolan
- Department of Chemistry, Faculty of Science; Menoufia University; Shebin El-Kom Egypt
| | - Yasser K. Abdel-Monem
- Department of Chemistry, Faculty of Science; Menoufia University; Shebin El-Kom Egypt
| | - Mohamed A. El-Nagar
- Department of Chemistry, Faculty of Science; Menoufia University; Shebin El-Kom Egypt
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Elshehy EA, Shenashen MA, Abd El-Magied MO, Tolan DA, El-Nahas AM, Halada K, Atia AA, El-Safty SA. Selective Recovery of Silver(I) Ions from E-Waste using Cubically Multithiolated Cage Mesoporous Monoliths. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700644] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Emad A. Elshehy
- National Institute for Materials Science (NIMS); 1-2-1 Sengen 305-0047 Tsukuba-shi Ibaraki-ken Japan
- Nuclear Materials Authority; El Maadi, Cairo Egypt
| | - Mohamed A. Shenashen
- National Institute for Materials Science (NIMS); 1-2-1 Sengen 305-0047 Tsukuba-shi Ibaraki-ken Japan
- Petrochemical Department; Egyptian Petroleum Research Institute (EPRI); Nasr City, Cairo Egypt
| | | | - Dina A. Tolan
- Chemistry Department; Faculty of Science; Menoufia University; Menoufia Egypt
| | - Ahmed M. El-Nahas
- Chemistry Department; Faculty of Science; Menoufia University; Menoufia Egypt
| | - Kohmei Halada
- National Institute for Materials Science (NIMS); 1-2-1 Sengen 305-0047 Tsukuba-shi Ibaraki-ken Japan
| | - Asem A. Atia
- Chemistry Department; Faculty of Science; Menoufia University; Menoufia Egypt
| | - Sherif A. El-Safty
- National Institute for Materials Science (NIMS); 1-2-1 Sengen 305-0047 Tsukuba-shi Ibaraki-ken Japan
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El-Nahas AM, Tolan DA, Emam SM, El-Boraey HA. Theoretical studies on the isomers and tautomers of 22-membered macrocyclic ligand. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.03.046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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El-Boraey HA, Emam SM, Tolan DA, El-Nahas AM. Structural studies and anticancer activity of a novel (N6O4) macrocyclic ligand and its Cu(II) complexes. Spectrochim Acta A Mol Biomol Spectrosc 2011; 78:360-370. [PMID: 21081283 DOI: 10.1016/j.saa.2010.10.021] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Revised: 09/29/2010] [Accepted: 10/18/2010] [Indexed: 05/30/2023]
Abstract
A novel (N6O4) macrocyclic ligand (L) and its Cu(II) complexes have been prepared and characterized by elemental analysis, spectral, thermal (TG/DTG), magnetic, and conductivity measurements. Quantum chemical calculations have also been carried out at B3LYP/6-31+G(d,p) to study the structure of the ligand and one of its complexes. The results show a novel macrocyclic ligand with potential amide oxygen atom, amide and amine nitrogen atoms available for coordination. Distorted square pyramidal ([Cu(L)Cl]Cl·2.5H2O (1), [Cu(L)NO3]NO(3)·3.5H2O (2), and [Cu(L)Br]Br·3H2O (4) and octahedral ([Cu(L)(OAc)2]·5H2O (3)) geometries were proposed. The EPR data of 1, 2, and 4 indicate d1x2(-y)2 ground state of Cu(II) ion with a considerable exchange interaction. The measured cytotoxicity for L and its complexes (1, 2) against three tumor cell lines showed that coordination improves the antitumor activity of the ligand; IC50 for breast cancer cells are ≈8.5, 3, and 4 μg/mL for L and complexes (1) and (2), respectively.
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Affiliation(s)
- Hanaa A El-Boraey
- Department of Chemistry, Faculty of Science, El-Menoufia University, Shebin El-Kom, Egypt
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Arps PJ, Marvel CC, Rubin BC, Tolan DA, Penhoet EE, Winkler ME. Structural features of the hisT operon of Escherichia coli K-12. Nucleic Acids Res 1985; 13:5297-315. [PMID: 2991861 PMCID: PMC321866 DOI: 10.1093/nar/13.14.5297] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The DNA sequence of a 2,3-kilobase segment of the E. coli hisT operon was determined. Analysis of the sequence indicated that the upstream gene in the operon encodes a 36,364-dalton polypeptide, which runs aberrantly on SDS-polyacrylamide gels. The distal hisT gene encodes the tRNA modification enzyme, pseudouridine synthase I, which was shown to have a polypeptide molecular mass of 30,399 daltons. The DNA sequence was consistent with the phenotypes and hisT expression of mutant operons. Analysis of the sequence and genetic complementation experiments demonstrated that the upstream and hisT genes are evolutionarily, structurally, and functionally unrelated; however, translation signals for the two genes overlap, which is consistent with genetic evidence suggesting translational coupling. Codon usage in the upstream gene is radically different from the hisT gene and may underlie the differential expression observed from the operon. Gene-inactivation experiments and S1-mapping of in vivo transcripts indicated that the operon contains an additional upstream gene. S1-mapping experiments also confirmed the presence of an internal promoter, which might be stringently controlled. Taken together, these results show that the structure of the hisT operon is complex and suggest that the operon might be regulated at several levels.
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